Redmagic 8 pro. Multitasking not working. Magisk not opening after install

[neins]

Device name: Redmagic 8 pro (NX729J) Rom name: v4.40 stock redmagic firmware Android version: 13 Pixelify version: 2.2

There are problems after installation:

• Stock launcher (Nubia launcher) had disappear. Game space launcher had disappear also
• Multitasking not working. I could push square button (or try to swipe bottom bar) but nothing happens. "Back" and "home" buttons are working
• Magisk doesn't open after installation. Just stuck on turquoise screen with mask, so I can't even turn off this module

I have had to make factory reset and install Magisk from scratch

[neins]

NB. I tried to switch to Nova launcher and hoped that it solve problem with multitask but it still doesn't work. I suppose that multitask feature bonded with stock Nubia launcher